Question

I’m using django-tagging and I’ve got an array of tag objects. What’s the best way to determine whether a given tag is among them?

def is_new (self):
    tags = Tag.objects.get_for_object(self) 
    tagged = False

    for tag in tags:
        if tag = 'new':
            tagged = True

    return tagged

Answer 1

I have never really used django tagging but looking through the source really quickly the .get_for_object returns a queryset of the tags for that object. Not an actual list.

I’m not sure if your code is working [appart from the assignment/comparison issue] or if you just want to improve it. But Since you are returning a queryset couldn’t you continue filtering it for instance:

Tag.objects.get_for_object(self).filter(name='new')

or to be able to use JamesO’s example of:

if 'new' in tags:
   return True

I think you need to turn the queryset into a list first.

list(tags)

And then it should work.

See documentation for forcing list evaluation – and note the memory concerns of doing that.

So my recommendation would be testing filtering first – and let us know if it works, because now I got curious.